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Compound reagent for portable occult blood trace appearing as well as preparation method and using method of compound reagent

A portable and traceable technology, which is applied in the direction of analyzing materials through chemical reactions, material analysis and measuring devices by observing the influence of chemical indicators, etc. Complicated problems, to achieve the effect of short response time, good display effect and simple operation

Inactive Publication Date: 2021-07-16
广东省大湾区华南理工大学聚集诱导发光高等研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although Acid Yellow is suitable for the color development of dark objects, the operation process requires fixing, dyeing and rinsing, which is complicated, time-consuming and labor-intensive, and it is better for displaying occult blood on non-permeable objects. , will stain the background and affect the contrast of the color [Li He, Luo Yaping. Analysis of blood occult shoe prints on dark permeable objects with acid yellow [J]. Journal of Yunnan Police Academy, 2014, 2, 75-78]

Method used

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  • Compound reagent for portable occult blood trace appearing as well as preparation method and using method of compound reagent
  • Compound reagent for portable occult blood trace appearing as well as preparation method and using method of compound reagent
  • Compound reagent for portable occult blood trace appearing as well as preparation method and using method of compound reagent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Experimental method

[0042] 1.1 Reagents and instruments

[0043] Triaryl methane dyes, lactic acid, calcium chloride, citric acid, sodium sulfite, hydrogen peroxide, beaker, measuring cylinder, brown bottle, watering can.

[0044] 1.2 Sample making

[0045] Choose eight kinds of objects, such as glass slide, white tile, black tile, black leather, black tire, black paper, red brick, cement brick, etc., and use a dropper to drip human blood (100% concentration, diluted 10 times, diluted 100 times, Dilute 1000 times, dilute 10000 times) on the object, and then drip or spray on different objects. Each object was tested three times.

[0046] 1.3 Research on the method of displaying traces of occult blood

[0047] 1.3.1 The best formula of the compound reagent for the appearance of traces of occult blood

[0048] Solution A configuration: first dissolve 4g of calcium chloride in 400mL of distilled water, then add 4g of triarylmethane dye, 1mL of lactic acid, 125mg o...

Embodiment 2

[0076] The formula of the compound reagent for the appearance of traces of occult blood is:

[0077] Solution A configuration: first dissolve 4g of sodium chloride in 400mL of distilled water, then add 4g of triarylmethane dye, 1mL of lactic acid, 125mg of citric acid, 325mg of sodium sulfite, and stir to dissolve;

[0078] Configuration of solution B: first dissolve 0.4g sodium chloride in 45mL distilled water, add 5mL 30% hydrogen peroxide and transfer to a brown bottle.

[0079] Other operations are the same as in Example 1, and the obtained results are basically the same.

Embodiment 3

[0081] The formula of the compound reagent for the appearance of traces of occult blood is:

[0082] Solution A configuration: first dissolve 4g of calcium chloride in 400mL of distilled water, then add 4g of triarylmethane dye, 1mL of lactic acid, 125mg of citric acid, 325mg of sodium sulfite, and stir to dissolve;

[0083] Configuration of solution B: first dissolve 0.4g calcium chloride in 45mL distilled water, add 5mL 30% hydrogen peroxide and transfer to a brown bottle.

[0084] Solution A and solution B of the compound reagent are mixed at a volume ratio of 6:1 for visualization;

[0085] Other operations are the same as in Example 1, and the obtained results are basically the same.

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Abstract

The invention discloses a compound reagent for portable occult blood trace appearing as well as a preparation method and a using method of the compound reagent. The compound reagent comprises a solution A and a solution B. The solution A comprises the following components in percentage by mass, 0.8-2.0% of triarylmethane dye, 0.1-0.9% of lactic acid, 0.8-10% of calcium chloride or sodium chloride, 0.02-0.5% of citric acid, 0.02-1.5% of sodium sulfite and the balance of water; and the solution B comprises 0.5-10% of calcium chloride or sodium chloride, 3-30% of hydrogen peroxide and the balance of water. The solution A and the solution B are mixed, the occult blood trace can be displayed by using the mixed reagent without additional equipment under the naked eye condition, operation is simple and rapid, the display effect is not influenced by the background color of the object, and the method can be suitable for displaying permeable and non-permeable object surfaces. The method is safe and non-toxic to human bodies, and can be suitable for appearing occult blood of tires and vehicle bodies during car accident escape and finding occult blood traces in crime scenes.

Description

technical field [0001] The invention belongs to the field of displaying occult blood traces, and in particular relates to a compound reagent for displaying portable occult blood traces, a preparation method and a use method thereof. Background technique [0002] Occult blood traces refer to potential blood traces that are difficult to observe with the naked eye, and are also a trace that often appears in crime scenes. These bloodstains are usually ignored by criminals, but they often play a very important role in the investigation of cases, especially the investigation of murder scenes, vehicles involved in accidents, and escape cases in car accidents. By discovering bloodstains and extracting the genetic information in the bloodstains, strong physical evidence can be provided for the case, and the criminal suspect can be identified in a targeted manner. Therefore, the technique of displaying traces of occult blood has very important application value. [0003] Currently, ...

Claims

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Application Information

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IPC IPC(8): G01N21/78
CPCG01N21/78G01N2021/775
Inventor 唐本忠魏星郝斌王志明刘勇伍盛鋆
Owner 广东省大湾区华南理工大学聚集诱导发光高等研究院
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